Milton jackson



(No Model.)

M. JACKSON. rGOMBINATIMI FINDER PoR LOCKS.

vPatented May 6, 1890.

lIo

UNITED STATES PATENT OFFICE..

MILTON JACKSON, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO TI-IE I). K. MILLER LOCK COMPANY, OF SAME PLACE.

COMBINATION-FINDER FOR LOCKS.

SPECIFICATION forming part of Letters Patent No. 427,421, dated May 6, 1890.

Application filed August 29, 1889. Serial No. 322,317. (No model.) l

To all whom t may concern.- i

Be it known that I, MILTON J AOKSON, a citizen of the United States, and a resident of Philadelphia, Pennsylvania, have invented an Improved Combination-Finder for Locks, of which thefollowing is a speciiication.

My invention consists of an improved device 'for determining the combination to which the permutation wheels or disks of a combination-lock are set, the object of the invention being to provide for accurately indicating the combination on the graduated face of the lock Without forming in the lock-case an opening of as great a width ,as the width of the notches in the permutation-disks This object I attain in the manner hereinafter set forth, reference being had to the accompanying drawings, in which- Figure l is a sectional View of a combination-,loclgilln stratin g the permutation disks or tumblers and the combination-Ender in elevation. Fig. 2 is a rear view of part of the lock; and Fig. 3 is a perspective view, on a larger scale, of the permutation-disks and combination-finder.

It is a common practice to provide the inner casing of a combination-lock with an opening in line with the notched faces of the permutation tu mblers or disks when they are in position for the entrance of the dog on the bolt, so that their position may be noted, or a pin may be passed through said openingfor engagement with the notches of the successive disks as they are turned to bring' said notches in line with the pin, the combination to which the lock is set being determined by inspection of the numbers on the knob and dial as the notches of successive tumblers are brought into line. If the opening is large enough to receive a pin of the full width of the notches, however, dust and dirt can freely enter the lock-casing, so as to clog or otherwise interfere with the delicate mechanism of the lock, and the tumblers and disks are, moreover, eX- posed to an unwarranted extent, while if, on

the other hand, the pin and its openings are small there is more or less lost motion of the permutation tumblers or disks, due to the iact that the pin does not iill the notches in the same; hence the indications given by the 5o graduated knob and dial of the lock are not accurate.

In carrying out my invention, therefore, I use a double pin A, the two prongs a of which are at a distance apart equal to the Width of the notches in the tumblers or disks d of the lock, each prong of the pin, however, being very small in diameter, and the opening b in the lock-case for the passage of the prongs of the pin being of correspondingly-small diam- 6o eter, as shown in Fig. 2, so that they are not subject to the objections attending the use of a single large opening, while, on the other hand, the prongs of the pin fill the notches in the disks or tumblers, and there is not that want of accuracy in the indications on the face of the lock which attends the use of a single small pin.

Having thus described my invention, I claim and desire to secure by Letters Patentl. The within-described combinationnder for combination-locks, the same consisting of a double pin, the prongs ot which are spaced to accord with the width of the notches in the permutation tumblers or disks of the lock,

vname to this specification in the presence of two subscribing witnesses.

MILTON JACKSON,

"Witnesses:

1I. F. REARDON, HENRY HovvsoN. 

